Gave it the name but after a few weeks I didn't fan it anymore
Did you have another name before? If so, you have to wait a month.
You can change your Minecraft name once a month if I'm not mistaken. Just try it out, the site would tell you anyway if it doesn't work!
Log in to minecraft.net
Then go to Profile> Edit / Delete Account
You then log on to the page and you can change it there
Open the Mojang website and log into your account.
In addition to the Minecraft logo and your player name, you will find the "Change" link.
Enter your desired name under "New profile name" and check availability using the "Check availability" button.
